From nobody Fri Jan 2 13:56:10 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85D17CD98CA for ; Tue, 10 Oct 2023 22:48:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231926AbjJJWsL (ORCPT ); Tue, 10 Oct 2023 18:48:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38930 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229547AbjJJWsJ (ORCPT ); Tue, 10 Oct 2023 18:48:09 -0400 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5629B99; Tue, 10 Oct 2023 15:48:08 -0700 (PDT) Received: by linux.microsoft.com (Postfix, from userid 1172) id CA09920B74C0; Tue, 10 Oct 2023 15:48:07 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com CA09920B74C0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1696978087; bh=7/ZIVn50LkClYO8V7dbxCg5jRS1URuYBZ92bH8lp5jA=; h=From:To:Cc:Subject:Date:From; b=Y20IsFwc2nBR62fY4pVvhX1kao+yZHmSBJUsKtUFgzbI1EjTU5TsKbTk+bDKUFOP7 7N2Z7IWfLx4y1xsXeX6OC8QUzK53mWZEDck3a3wicf8ejXOi+b2haXMZz/tFpt7KcK GY4N0zv2Mfi5fCtJJ4QFMi+Zuwgh61ZnJcw3WwhA= From: Angelina Vu To: linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com Subject: [PATCH] hv_balloon: Add module parameter to configure balloon floor value Date: Tue, 10 Oct 2023 15:48:07 -0700 Message-Id: <1696978087-4421-1-git-send-email-angelinavu@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Currently, the balloon floor value is automatically computed, but may be too small depending on app usage of memory. This patch adds a balloon_floor value as a module parameter that can be used to manually configure the balloon floor value. Signed-off-by: Angelina Vu --- drivers/hv/hv_balloon.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index 64ac5bdee3a6..87b312f99b2e 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -1101,6 +1101,10 @@ static void process_info(struct hv_dynmem_device *dm= , struct dm_info_msg *msg) } } =20 +unsigned long balloon_floor; +module_param(balloon_floor, ulong, 0644); +MODULE_PARM_DESC(balloon_floor, "Memory level (in megabytes) that ballooni= ng will not remove"); + static unsigned long compute_balloon_floor(void) { unsigned long min_pages; @@ -1117,6 +1121,9 @@ static unsigned long compute_balloon_floor(void) * 8192 744 (1/16) * 32768 1512 (1/32) */ + if (balloon_floor) + return MB2PAGES(balloon_floor); + if (nr_pages < MB2PAGES(128)) min_pages =3D MB2PAGES(8) + (nr_pages >> 1); else if (nr_pages < MB2PAGES(512)) --=20 2.34.1